Private method setPostingImplementation in BitPostingIndex

Details

Description

The private method setPostingImplementation in BitPostingIndex has been introduced in Terrier 3.5. In this method, the IterablePosting implementation constructor is "preloaded". In Terrier 3.0, it was "obtained directly in the public getPostings method.
Now it is impossible to overload the setPostingImplementation method, then the aforementioned constructor is "hard coded" in terms of parameters: